I just purchased a new house and today I noticed that the water meter's 'little gear' (sorry, don't know the terminology) was turning even after I turned off the main supply line Globe Valve. I also noticed that the valve appears to have a small leak in that water is beading into drops on the valve... it's not a drip-drip-drip... but just a beading... quite slow... is that enough for the water meter movement to be noticeable or do I likely have a supply line leak coming to the house?

OR, how best to diagnose?